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I'm currently looking at this start tutorial video for angular.js
At some moment (after 12'40"), the speaker states that the attributes ng-app and data-ng-app="" are more or less equivalent inside the <html> tag, and so are ng-model="my_data_binding and data-ng-model="my_data_binding". However The speaker says the html would be validated through different validators, depending on which attribute is used.
Could you explain the difference between the two ways, ng- prefix against data-ng- prefix ?
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For AngularJS there is no difference between ng-app and data-ng-app or ng-controller and data-ng-controller or ng-model and data-ng-model because while compiling HTML page, AngularJS strips data- or x- prefix. Find the URL for reference.
Definition and Usage. The ng-app directive tells AngularJS that this is the root element of the AngularJS application. All AngularJS applications must have a root element. You can only have one ng-app directive in your HTML document. If more than one ng-app directive appears, the first appearance will be used.
AngularJS DirectivesThe ng-app directive initializes an AngularJS application. The ng-init directive initializes application data. The ng-model directive binds the value of HTML controls (input, select, textarea) to application data. Read about all AngularJS directives in our AngularJS directive reference.
The first ngApp found in the document will be used to define the root element to auto-bootstrap as an application. To run multiple applications in an HTML document you must manually bootstrap them using angular. bootstrap instead. AngularJS applications cannot be nested within each other.
Good question. The difference is simple - there is absolutely no difference between the two except that certain HTML5 validators will throw an error on a property like ng-app, but they don't throw an error for anything prefixed with data-, like data-ng-app.
So to answer your question, use data-ng-app if you would like validating your HTML to be a bit easier.
Fun fact: You can also use x-ng-app to the same effect.
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